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Simulation of Jetting in Injection Molding Using a Finite Volume Method

In order to predict the jetting and the subsequent buckling flow more accurately, a three dimensional melt flow model was established on a viscous, incompressible, and non-isothermal fluid, and a control volume-based finite volume method was employed to discretize the governing equations. A two-fold...

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Detalles Bibliográficos
Autores principales: Hua, Shaozhen, Zhang, Shixun, Cao, Wei, Wang, Yaming, Shao, Chunguang, Liu, Chuntai, Dong, Binbin, Shen, Changyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6432440/
https://www.ncbi.nlm.nih.gov/pubmed/30979273
http://dx.doi.org/10.3390/polym8050172
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author Hua, Shaozhen
Zhang, Shixun
Cao, Wei
Wang, Yaming
Shao, Chunguang
Liu, Chuntai
Dong, Binbin
Shen, Changyu
author_facet Hua, Shaozhen
Zhang, Shixun
Cao, Wei
Wang, Yaming
Shao, Chunguang
Liu, Chuntai
Dong, Binbin
Shen, Changyu
author_sort Hua, Shaozhen
collection PubMed
description In order to predict the jetting and the subsequent buckling flow more accurately, a three dimensional melt flow model was established on a viscous, incompressible, and non-isothermal fluid, and a control volume-based finite volume method was employed to discretize the governing equations. A two-fold iterative method was proposed to decouple the dependence among pressure, velocity, and temperature so as to reduce the computation and improve the numerical stability. Based on the proposed theoretical model and numerical method, a program code was developed to simulate melt front progress and flow fields. The numerical simulations for different injection speeds, melt temperatures, and gate locations were carried out to explore the jetting mechanism. The results indicate the filling pattern depends on the competition between inertial and viscous forces. When inertial force exceeds the viscous force jetting occurs, then it changes to a buckling flow as the viscous force competes over the inertial force. Once the melt contacts with the mold wall, the melt filling switches to conventional sequential filling mode. Numerical results also indicate jetting length increases with injection speed but changes little with melt temperature. The reasonable agreements between simulated and experimental jetting length and buckling frequency imply the proposed method is valid for jetting simulation.
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spelling pubmed-64324402019-04-02 Simulation of Jetting in Injection Molding Using a Finite Volume Method Hua, Shaozhen Zhang, Shixun Cao, Wei Wang, Yaming Shao, Chunguang Liu, Chuntai Dong, Binbin Shen, Changyu Polymers (Basel) Article In order to predict the jetting and the subsequent buckling flow more accurately, a three dimensional melt flow model was established on a viscous, incompressible, and non-isothermal fluid, and a control volume-based finite volume method was employed to discretize the governing equations. A two-fold iterative method was proposed to decouple the dependence among pressure, velocity, and temperature so as to reduce the computation and improve the numerical stability. Based on the proposed theoretical model and numerical method, a program code was developed to simulate melt front progress and flow fields. The numerical simulations for different injection speeds, melt temperatures, and gate locations were carried out to explore the jetting mechanism. The results indicate the filling pattern depends on the competition between inertial and viscous forces. When inertial force exceeds the viscous force jetting occurs, then it changes to a buckling flow as the viscous force competes over the inertial force. Once the melt contacts with the mold wall, the melt filling switches to conventional sequential filling mode. Numerical results also indicate jetting length increases with injection speed but changes little with melt temperature. The reasonable agreements between simulated and experimental jetting length and buckling frequency imply the proposed method is valid for jetting simulation. MDPI 2016-05-04 /pmc/articles/PMC6432440/ /pubmed/30979273 http://dx.doi.org/10.3390/polym8050172 Text en © 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hua, Shaozhen
Zhang, Shixun
Cao, Wei
Wang, Yaming
Shao, Chunguang
Liu, Chuntai
Dong, Binbin
Shen, Changyu
Simulation of Jetting in Injection Molding Using a Finite Volume Method
title Simulation of Jetting in Injection Molding Using a Finite Volume Method
title_full Simulation of Jetting in Injection Molding Using a Finite Volume Method
title_fullStr Simulation of Jetting in Injection Molding Using a Finite Volume Method
title_full_unstemmed Simulation of Jetting in Injection Molding Using a Finite Volume Method
title_short Simulation of Jetting in Injection Molding Using a Finite Volume Method
title_sort simulation of jetting in injection molding using a finite volume method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6432440/
https://www.ncbi.nlm.nih.gov/pubmed/30979273
http://dx.doi.org/10.3390/polym8050172
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